Preface
MicroLogix 1000 Programmable Controllers User Manual
G–6
save: To upload (transfer) a program stored in memory from a controller to a
personal computer; OR to save a program to a computer hard disk.
scan time: The time required for the controller to execute the instructions in the
program. The scan time may vary depending on the instructions and each
instruction’s status during the scan.
sinking: A term used to describe current flow between an I/O device and controller
I/O circuit — typically, a sinking device or circuit provides a path to ground, low, or
negative side of power supply.
sourcing: A term used to describe current flow between an I/O device and
controller I/O circuit — typically, a sourcing device or circuit provides a path to the
source, high, or positive side of power supply.
status: The condition of a circuit or system, represented as logic 0 (OFF) or 1
(ON).
terminal: A point on an I/O module that external I/O devices, such as a push button
or pilot light, are wired to.
throughput: The time between when an input turns on and the corresponding
output turns on.
true: The status of an instruction that provides a continuous logical path on a ladder
rung.
update time: For analog inputs, the time between updates to the meory of the
analog controller of the digital value representing the analog input signal.
For analog outputs, the time from the digital code being received at the analog
controller to the analog output signal of the digital code being output at the
terminals of the ouput channel.
upload: Data is transferred to a programming or storage device from another
device.
user interrupt poll: While executing the user program, the controller firmware
checks for user interrupts that need servicing.
watchdog timer: A timer that monitors a cyclical process and is cleared at the
conclusion of each cycle. If the watchdog runs past its programmed time period, it
will cause a fault.
workspace: The main storage available for programs and data and allocated for
working storage.
write: To copy data to a storage device. For example, the processor WRITEs the
information from the output data file to the output modules.
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